On woocommerce how do I remove this cropping to product catergory thumbnails?
Update for WooCommerce 3.4
The thumbnail sizes are now available in the Customizer. You'll need to open the Customizer, then select WooCommerce, then Product Images.
The "main image" is the single product image. And the "thumbnail" is the shop/archive loop image.
The settings are no longer available in the admin Settings.
The category images are the same size as shop_image (or Catalog) thumbnail. WooCommerce handles its product thumbnails in its settings:
WooCommerce->Settings>Products>Display
You can change its height, width, and toggle the hard crop on/off.
After changing the image sizes you will need to regenerate thumbnails.
Firstly, go to Theme Options> Shop settings, and set Enable Product Image Crop on Catalog pages to OFF.
Then navigate to Appearance> customize> WooCommerce> Product images, and set Thumbnail cropping to uncropped.
Save the settings, and view your shop page out of the customizer. Your full images should display.
Let me know if that works for you.